REINSURANCE - Schedule of Affiliated Quota Share Reinsurance Agreements for all New and Renewal Business for the Indicated Coverage Period (Details) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CAD ($)
01/01/2010-12/31/2010
Related Party Transaction [Line Items]
Percent Ceded	44.00%	44.00%
Single Occurrence Limit	$ 150
Aggregate Limit	$ 325
01/01/2011-12/31/2011
Related Party Transaction [Line Items]
Percent Ceded	50.00%	50.00%
Single Occurrence Limit	$ 150
Aggregate Limit	$ 300
01/01/2012-12/31/2014
Related Party Transaction [Line Items]
Percent Ceded	50.00%	50.00%
Single Occurrence Limit	$ 100
Aggregate Limit	$ 200
01/01/2015-12/31/2016
Related Party Transaction [Line Items]
Percent Ceded	50.00%	50.00%
Single Occurrence Limit	$ 163
Aggregate Limit	$ 325
01/01/2017-12/31/2017
Related Party Transaction [Line Items]
Percent Ceded	60.00%	60.00%
Single Occurrence Limit	$ 219
Aggregate Limit	$ 438
01/01/2010-12/31/2010
Related Party Transaction [Line Items]
Percent Ceded	60.00%	60.00%
Single Occurrence Limit		$ 350
Aggregate Limit		$ 0
01/01/2011-12/31/2011
Related Party Transaction [Line Items]
Percent Ceded	60.00%	60.00%
Single Occurrence Limit		$ 350
Aggregate Limit		$ 0
01/01/2012-12/31/2012
Related Party Transaction [Line Items]
Percent Ceded	75.00%	75.00%
Single Occurrence Limit		$ 206
Aggregate Limit		$ 413
01/01/2013-12/31/2013
Related Party Transaction [Line Items]
Percent Ceded	75.00%	75.00%
Single Occurrence Limit		$ 150
Aggregate Limit		$ 413
01/01/2014-12/31/2017
Related Party Transaction [Line Items]
Percent Ceded	75.00%	75.00%
Single Occurrence Limit		$ 263
Aggregate Limit		$ 413
01/01/2012-12/31/2017
Related Party Transaction [Line Items]
Percent Ceded	80.00%	80.00%
Single Occurrence Limit	$ 0
Aggregate Limit	$ 0
01/01/2020
Related Party Transaction [Line Items]
Percent Ceded	100.00%	100.00%
Single Occurrence Limit	$ 0
Aggregate Limit	$ 0